1. To take the last of something when you don't really want it, usually just to piss someone off.

2. To open something just to get the first ot it, for the same reason as above.

1. guy #1: "Dude, why did you take that slice of pizza, when you didn't finish the one you have?"
guy #2: "You know.....reservations."

2. babe #1: "Did you see how she took the new pack of gum, when the older-style packaged ones taste better?"
babe #2: "Yeah I know..she takes reservations like at the Hotel Marriot just a little too far. She's queer."